Finally I've managed to compile xbmc, and therefore test if changing the addresses would work.

To be honest, I think the impact of changing it for me would be too big, so I made a bug report.

[offtopic]
Also, the wiki list of built in functions is outdated on the pwmcontrol part:
it should say XBMC.system.pwmcontrol(#ColorA,#ColorB,#WA,#WB,action,xTime)
where #WA and #WB is a value between #00 and #ff for the white status led in (allthough it can only be on or off)

I couldn't edit the wiki though, and I'm not sure where to post this
[/offtopic]